code: def block_separator(line1, line2, block_type1, block_type2):
      sep = "\n"
      if block_type1 == "Text":
          sep = "\n\n"
  
      return sep + line2
  
file_path: pdf-to-markdown/marker/markdown.py
imports: from marker.schema import MergedLine, MergedBlock, FullyMergedBlock, Page
  import re
  from typing import List
label_desc: Use image node_id 5 for calling a global function with example usage: block_separator(line1, line2, block_type1, block_type2) and returns: unknown